search for: include_keys

Guys, I need to parse my dovecot log files with logstash grok patterns. Is there any document specifying the patterns used by dovecot to write it's logs? I need to find all the log possibilities that could be writed to log files by dovecot. So, if a document like that exists or if anyone could answer my question, I'll could make the parser with less difficult. -- Att. Bruno